[exim] How to remove Exim version from Email Header

Hello All,

I am using exim 4.72 , installed from yum repo, Now I want to remove
Exim version (*(Exim 4.72)*)from the Email header. and any idea how can
we remove that " *(Dovecot) with LMTP id* " also.

Received: from solo.techblue.co.uk
    by solo.techblue.co.uk*(Dovecot) with LMTP id*  dKRJJWFSxVJxXwAAG2fxGQ
    for <anant.saraswat@???>; Thu, 02 Jan 2014 11:53:14 +0000
Received: from [210.7.X.X] (helo=[192.168.100.71])
    by solo.techblue.co.uk with*esmtp (Exim 4.72)*
    (envelope-from <test@???>)
    id 1Vygpt-0006Pt-Kt
    for anant.saraswat@???; Thu, 02 Jan 2014 11:53:14 +0000

Thanks & Regards,

Anant Saraswat
anant.saraswat@???